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Let alpha and beta be the roots of x...

Let ` alpha and beta ` be the roots of ` x^(2) - 6x - 2 = 0 , ` with ` alpha gt beta `. If
` alpha _(n) = a^(n) - beta^(n) ` for `a ne 1` , then the values of `(a_(10) - 2a_(8))/(2a_(9))` is

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